Antares Auto-Tune 4, professional pitch correction software, is now available for Mac OS X and Mac OS 9.x versions of Mac RTAS, Mac VST and MAS. Auto-Tune 4 builds on the power of Auto-Tune 3 to add a host of new features designed to provide new capabilities while at the same time streamlining operation, according to Antares. Upgrades from all previous versions of Auto-Tune are available, as is a downloadable, 10-day trial version.